Molding die



Aug. g

J. w. BISHOP MOLDING DIE Filed Feb warm Patentedug. 12, 1924.

UNITED STATES PATENT OFFICE.

JOSEPH BISHOP, 0E MUSKEGON, MICHIGAN, ASSIGNOR T0 THE BRUNSWICK- BALKE-COLLENDER COMPANY, OF WILMINGTON, DELAWARE-A COBPORATIUN F DELAWARE.

HOLDING- DIE.

Application led February 23, 1924. Serial No. 694,647.

To `alllwhor'n, t may cofwem:

A will travel in a forward directionin one channel and then pass on to the next chan- Be it known that I, JOSEPH W. BISHOP., a citizen of the United States, residingvat Muskegon, in the county of'Muskegon and State of Michigan, have invented certain new and useful Improvementsdn Molding- Dies, of which the following is a specilication.

' This invention relates-to improvements in molding dies of that class which are pro 'vided 'with channels or passages for the circulation of steam and water 1n the heating and cooling steps of the molding opera-y tion. f

I-Ieretofore molding dies have been provided with partitions so constructed and arran ed that the steam and rwater are caused to ow in a tortuous passage provided in some cases by a plurality of concentric channels so connected that the steam or water nel and travel 'in a reverse direction therein, and to .the next channel andpass in a forward directionl therein, and sov on. To produce this tortuous customary vto leave en s of the partitions o forming the concentric channels unsupported, and it has been found that these unsupported ends are liable to breakdown under the tremendous pressure which is employed, for example, in the manufactureof phonograph records. These tortuous passages provide pockets or dead corners where residue accumulates and finally interferes '.with l the proper circulation. Furthermore,- it is a comparatively expensive and somewhat difficult matter to make a die with vsuch a tortuous passage as I have indicated.

- dies for the manufacture of. hono My invention has for its object to sim 'lify and improve the 4construction of mo din al records and such-other things or whgidh it may be adapted,to reduce the cost of manuacturing the dies, to im rove the circula'- tion by the elimination o cornersand deadA ends where the residuemay accumulate, and to support and protect the ends of the partitions orming the vchannels of the passage so that they will withstand-heavy pressure employed in using the dies without breaking down.

assage, it has beenv In the accompanying' drawings. illustratingmy 1nvention 1g. 1 is an edge view partly in section of a die for making a phonograph record and embodying my invention.

\ Fig. 2 is a plan view partly broken away. Fig. 3 is a sectional View on the line 3.-'-3

offFlg. 2.

tion which will be readily. understood.

The die 5 is rovided with 'an annular recess 6 at the ottom of which is a plurality of concentric channels 7 formed by intermediate partitions 8. A back plate or cover plate 9 is secured in the recess 6 and forms one 4wall of the channels. An .inlet '10 communicates with ,the inner channel so that steam or water may be introduced to the die at or about the center thereof to gradually spread out to the periphery where 1t escapes t rough the ipe 11. The partltions are concentrical y arranged and a radial' oove is cut through the to receive a plug 12 which is rlgidly secured inthe die below the back or cover plate (Fig. 3 Diagonal channels 13 are arranged m-t 'e plug to connect the end of the inner-channel with the be ing of the next channel at the other si e ofthe plug, and to connect the end of the second channel on` one side.

artitions atone side'of the plugk outlet 11 after owing throughout said pasy sa e. B arranging diagonal'channels 13 ingt-he plug to connect the ends of alternate concentric passages 7 and produce what amounts, in effect, to a continuous spiral wage' ows forward from an inlet atxor about t e 1n which the steam or-.water alwa vs l lonal channels produces a continuous middle to an .outlet at or about the periphery of the die; and I accomplish this in a simple aiid comparatively inexpensive manner by on'necting the ends of concentric channels through the diagonal channels 13 so that a forward iow of steam or water throughla continuous passage is provided.

I find that a die constructed in accorda-nce with my: invention will heat and cool more uniformly than has been the case where' the steam and water assa has been tortuous, Vand'this'.is a }iiigh y desirable quality in dies for making phonograph records. My invention lalso provides or cooling the die from the center outward, which is also desirable to prevent the diefrom war ing. The plugforms a support for the en s of the partitions` 8 and prevents them from breakin down under the pressure of the press. or corners in the passage where residue 'may accumulate and hence good circulation can be maintained at all times.

A matrix 14 is secured in place against the face of the die by a clamping ring 15 and the lockingring 16 or other suitable means.

My improved die can be easily manufactured by turning the concentric channel 7 therein and then cutting through the partitions to accommodate the plug 12, which is secured therein in a proper position and, after-which, the back or cover plate 9 is suitably secured in place. My improved die can be made at less cost than those having a tortuous channel and the provision of concentric channels connected by diag kassage throfugh which the steam or water ows forward and more efficiently heats and cools y the die than has been customary herebefore.

In the drawings I have illustrated a simple and eiective embodiment of my inventionin a phonograph record die which I have used with satisfactory results, but I appreciate the fact that it may be necessary o'rldesirable to change vthe construction and arrangement of parts to adapt the die for .different presses or for different purposes, and I reserve the right to make all such here are no recesses or dead ends,

scribed having a plurality of concentric channels and intermediate partitions, and a plug intersecting said channels and partitions and havin di onal channels therein connecting t e erls of the concentric channels on one side of the plu" with the other ends of said concentric channels on the other side of the plug.

2. A molding die of the character described having a plurality of concentric partitions forming channels therebetween, a plug intersecting said channels and par titions and engaging and forming a support for the ends of said partitions, said plug having diagonal channels therein connecting said concentric channels.

3. A molding die of the character described having a plurality of. concentric channels and intermediate partitions, and

-a plug intersect-ing said channels and partitions and having dia nal channels therein connecting the en s of said concentric channels in staggard relation.

.4. A molding die of the character described having a plurality of concentric channels and intermediate partitions, an inlet connected withthe inner channel, an outlet` connected witlr4 the outer channel, and a 4plug located between said inlet and outlet and intersecting said channels and partitions, said plug having channels there- 1n connecting said concentric channels in staggard relation.

5. A molding die of the character described having a plurality of concentric channels and intermediate partitions, an inlet connected with theinner channel, an outlet connected with the outer channel, a plug located between said inlet and outlet and intersecting said channels and partitions, said (plug forming a support for the ends off sai partitions and havlng dia onal channels therein connecting the ends o said concentric channels in staggard relation.

JOSEPH W. BISHOP. 

